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Finding the Fourth Proportional to 313.31, 470 and 120.94

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Solution

The fourth proportional to 313.31, 470 and 120.94 is: 181.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    313.31 : 470 = 120.94 : x
  2. Step 2: Convert to fraction form
    313.31/470 = 120.94/x
  3. Step 3: Cross multiply
    313.31x = 470 × 120.94
  4. Step 4: Simplify right side
    313.31x = 56,841.80
  5. Step 5: Solve for x
    x = 56,841.80/313.31
  6. Step 6: Final answer
    x = 181.42

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.